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Employee Benefit Plans - Summary of Changes in the Fair Value of Level 3 (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Changes in the fair value of Level 3 assets |
Fair value of plan assets — beginning of year | $ 453.1
Fair value of plan assets — end of year | 397.2
Global equity common trust funds |
Changes in the fair value of Level 3 assets |
Fair value of plan assets — beginning of year | 50.6
Fair value of plan assets — end of year | 41.1
Commingled global fund allocations |
Changes in the fair value of Level 3 assets |
Fair value of plan assets — beginning of year | 95.1
Fair value of plan assets — end of year | 83.3
Fixed income common trust funds |
Changes in the fair value of Level 3 assets |
Fair value of plan assets — beginning of year | 270.2
Fair value of plan assets — end of year | 228.5
Other |
Changes in the fair value of Level 3 assets |
Fair value of plan assets — beginning of year | 1.0
Fair value of plan assets — end of year | 1.0
Significant Unobservable Inputs (Level 3) |
Changes in the fair value of Level 3 assets |
Fair value of plan assets — beginning of year | 1.0
Fair value of plan assets — end of year | 1.0
Significant Unobservable Inputs (Level 3) | Global equity common trust funds |
Changes in the fair value of Level 3 assets |
Fair value of plan assets — beginning of year | 0.0
Fair value of plan assets — end of year | 0.0
Significant Unobservable Inputs (Level 3) | Commingled global fund allocations |
Changes in the fair value of Level 3 assets |
Fair value of plan assets — beginning of year | 0.0
Fair value of plan assets — end of year | 0.0
Significant Unobservable Inputs (Level 3) | Fixed income common trust funds |
Changes in the fair value of Level 3 assets |
Fair value of plan assets — beginning of year | 0.0
Fair value of plan assets — end of year | 0.0
Significant Unobservable Inputs (Level 3) | Other |
Changes in the fair value of Level 3 assets |
Fair value of plan assets — beginning of year | 1.0
Fair value of plan assets — end of year | $ 1.0

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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